Using the above formalism, we investigate the spin-dependent
transport in the considered structures. Throughout the work, we set
\(t = 2.66\)  eV [1]} in the graphitic regions and assume that
\(t_L\)  is equal to \(t\)  and \(t_C \le t\)  in the NGN junctions
[2]}, [3]}. Our consideration is restricted to the
low-energy regime when \(E \ll t\) .
